Why concreter quotes can vary so much
Concrete work looks straightforward from the outside, but quotes can differ a lot because the final price depends on far more than the size of the slab. A concreter may need to factor in site access, excavation, base preparation, boxing, reinforcement, concrete type, finish, curing time, removal of spoil, and whether any old concrete has to be broken out first.
In New Zealand, seasonality also matters. Spring and summer are busy periods, so tradespeople may be booked out further in advance and prices can be firmer. In winter, work is still done, but wet weather, cooler temperatures and shorter drying conditions can affect scheduling and finish quality. A quote that seems higher may simply reflect a more realistic allowance for site conditions and labour.
Start by being clear about the job
Before you request quotes, define the work as clearly as you can. The more precise your brief, the more comparable the quotes will be.
Include:
- the type of project: driveway, patio, path, slab for a shed, house foundation work, retaining wall footing, stairs, or decorative concrete - the approximate dimensions in metres - the thickness you want, if known - whether you need demolition and removal of existing concrete - site access details: narrow driveway, steep section, shared access, or hand-only access - slope, drainage, or soft-ground issues - your preferred finish: plain, broom, exposed aggregate, coloured, or polished - whether you need cutting, saw joints, sealing, or edging - timing constraints, such as a move-in date or a council inspection deadline
If you have plans, a sketch, or photos, send them. A site visit is still important, but good information up front saves time and reduces misunderstandings.
How to request quotes properly
Ask at least three concreters for written quotes. In New Zealand, many tradies will happily give a rough ballpark over the phone, but you should always ask for a written quote before you commit.
A good quote request should say:
- what you want done - where the site is - whether access is easy or difficult - when you’d like the work completed - that you want the quote itemised if possible - that you’d like any assumptions listed clearly
It helps to ask each concreter the same questions so you can compare like with like:
- Are you doing the excavation and site prep, or do I need another contractor? - Is spoil removal included? - Does the quote include mesh or reinforcing steel? - Is concrete supply included, and what strength/type is assumed? - Are council fees, consent costs, engineering, and inspections included if needed? - Is the finish included, or is sealing an extra? - How do you handle extra work if the ground conditions are different from expected? - Is GST included? - What is the expected start date and how long will the job take?
If a concreter won’t give you a written quote, that’s a red flag.
What a good concreter quote should include
A proper quote should be specific enough that you know what you are paying for. It does not need to be a novel, but it should avoid vague wording like “supply and install concrete as required”.
Look for these details
| Item | What to check | |---|---| | Scope of work | Clear description of exactly what will be built or replaced | | Measurements | Area or length in metres, and thickness if relevant | | Site preparation | Excavation, levelling, compaction, basecourse, boxing, and disposal of spoil | | Reinforcement | Mesh, steel, fibres, dowels, or any structural reinforcement | | Concrete specification | Strength, mix type, colour, exposure grade, or decorative finish | | Finish and detailing | Broom finish, trowel finish, exposed aggregate, saw cuts, edging, sealing | | Labour and plant | Labour, machine hire, concrete pump, tip fees, access equipment | | GST | Whether GST is included or added on top | | Exclusions | What is not included, such as drainage work, landscaping, or council fees | | Timeframe | Start window, estimated duration, and weather delays | | Payment terms | Deposit, progress payments, and final payment timing | | Warranty/defects | Any workmanship guarantee and how issues are handled |
If the quote is for structural work, such as a slab supporting a building, ask whether the job follows the relevant plans or engineer’s requirements. Building work may need a building consent from your local council, depending on the project. The concreter should not be guessing when consent or engineering is needed.
Fixed price vs charge-up: what’s the difference?
Concreter quotes in New Zealand are usually either fixed price or charge-up.
Fixed price
A fixed price quote means the concreter agrees to complete the job for a set amount, usually based on assumptions about the site and scope.
**Best for:** - straightforward driveways, paths, and patios - clearly defined jobs with good access - homeowners who want budget certainty
**Pros:** - you know the total cost upfront - easier to compare against other quotes - less risk of bill shock
**Cons:** - the quote may include a buffer for unknowns - variations can still increase the price if the scope changes
Charge-up
A charge-up job means you pay for actual labour, materials, and plant time, often at agreed hourly or daily rates, plus costs.
**Best for:** - jobs where the scope is uncertain - difficult access or unknown ground conditions - repair work, extensions, or projects with a lot of unknowns
**Pros:** - can be fairer when the job is hard to estimate - you pay for actual time rather than a padded estimate
**Cons:** - the final cost is less certain - it is harder to compare quotes - costs can rise quickly if the job takes longer than expected
If you choose charge-up, ask for a written estimate, a rate schedule, and a clear approval process for extra work. That way you know when the job is drifting beyond the estimate.
How to compare quotes fairly
The cheapest quote is not always the best value. To compare properly, line the quotes up against the same scope and assumptions.
Check:
- whether each quote includes the same amount of excavation and disposal - whether base preparation and compaction are included - whether reinforcement is the same - whether the slab thickness and concrete strength are the same - whether GST is included in the total - whether council or engineering costs are included or excluded - whether sealing, cutting, and finishing are included - whether the site access assumptions are realistic
A good way to compare is to create a simple checklist and mark each quote against it. If one quote is cheaper because it excludes removal of spoil, mesh, or sealing, it is not truly cheaper once those extras are added.
Also compare the programme. A lower price is not much use if the concreter cannot start for three months and you need the job done sooner. In peak season, a realistic start date can be worth paying for.
Spotting quotes that are too cheap
A quote that is far below the others deserves careful checking. Sometimes a lower price is legitimate, but often it means something has been missed.
Common reasons a quote is too cheap:
- no allowance for site prep or excavation - shallow slab thickness compared with the others - no reinforcement or insufficient reinforcement - spoil removal is excluded - no allowance for pump hire or difficult access - low-grade materials or a less durable finish - GST is not included - the quote relies on vague “extras as required” wording - the concreter is underestimating labour time
A suspiciously low quote can end up costing more later through variations, delays, or premature cracking and repairs. For exterior work in NZ, drainage and base preparation matter a lot because of wet winters, clay soils in some regions, and ground movement. If the site has poor drainage or soft ground, you want a quote that addresses it properly rather than one that simply ignores it.
Check credentials before you hire
A concreter does not need a special government licence just to pour concrete in the way electricians or gasfitters do, but that does not mean you should skip checks.
Before accepting a quote, ask whether they:
- have relevant experience with the type of work you need - have public liability insurance - can provide references or photos of recent local work - are a registered business with a clear invoice and contact details - understand any consent, engineering, or local council requirements for your project
If the job also involves plumbing, gasfitting, drainlaying, or electrical work, those parts must be handled by appropriately authorised professionals under the relevant NZ rules. Concrete contractors should not be doing restricted plumbing or electrical work unless they are properly licensed for it.
For jobs that need a building consent, make sure you know who is responsible for supplying drawings, engineering, and inspections. A good concreter will be clear about the limits of their scope.
Ask about variations before work starts
Even with a fixed price, changes happen. The key is to manage them properly.
Ask how variations will be handled if:
- the ground is softer than expected - there is extra excavation needed - old concrete is thicker than anticipated - drainage issues are discovered - you change the design, finish, or size after the quote is accepted
A fair quote should explain how extra work is priced and who needs to approve it. Never assume a verbal promise is enough. If the scope changes, get the change in writing before the work proceeds.
What to do before you accept a quote
Before signing off, make sure you are comfortable with the full picture:
- the total price, including GST - the exact scope of work - what is excluded - start date and expected duration - payment schedule and deposit amount - who is responsible for permits, consent, or engineering if required - what happens if weather delays the pour - what warranty or workmanship support is offered
If two quotes are close but one is better documented, more specific, and includes proper prep, that is often the safer choice. Concrete is long-term work. Saving a little upfront is not worth a slab that cracks, sinks, or sheds water the wrong way.
The bottom line
To get a good concreter quote in NZ, give clear project details, ask for written itemised quotes, and compare them on the same basis. Focus on scope, prep, reinforcement, finish, exclusions, and GST rather than just the headline price. A quote that is realistic, specific, and transparent is usually better value than one that looks cheap at first glance.
For most homeowners, the smartest approach is simple: get multiple quotes, check credentials, and choose the one that explains the job properly, not just the one with the lowest number.